She has a bunch of toys to choose from, and her favorite toy is, my feet. She's constantly is biting me, and only me. She chases me around trying to munch on my toes. I thought it was cute at first, but now its becoming a normal thing for her. I've tried telling her no and tapping her on the nose, but she's starting to get defensive about it, and she'll bark at me. I know she doesn't know any better but how do I handle this, before it turns into a habit?